a) Fighting Matsuri Challenge will be available every Monday and Friday. Players need to sign up for the challenge between 19:00-19:10, selecting 12 ninjas (at least Level 20) to participate in the battle.

b) The battlefield will be opened at 19:10, which will last for 2 hours and 50 minutes. Fight with others to complete the mission until all of your ninjas have been defeated.

So.. its just like sage world battlefield crossed with ranked battle? fight with other players?
And what are the type of rewards? Can you elaborate?